The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 22, 1994
Filed:
Apr. 08, 1992
Applicant:
Inventors:
Assignee:
Nippondenso Co., Ltd., Kariya, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B21D / ; B21D / ;
U.S. Cl.
CPC ...
29890049 ; 72180 ; 72385 ; 72414 ;
Abstract
The strip 2 is inserted between forming rollers 1a and 1b so that fins 3 are formed on the strip 2. The forming rollers 1a 1b have a line of protrusion protruding radially on the periphery thereof and the protrusion of one roller mates with protrusion of the other roller. A pair of forming rollers or more pairs of forming rollers are employed. A part of the strip 2 sandwiched between side face portions 13a and 14a of the protrusion 13 and 14 is pressed in the direction of the thickness of the strip with a stress between yield stress and maximum stress of the strip 2. To adjust the stress, a clearance G between protrusions is controlled.